I got my best car boot buy out and used one yesterday.
About twenty five years ago I walked down through the car boot in dismal weather in mid winter. I iffed and butted whether to bother, but I was walking that way anyway. There were only six or seven cars there and I got to the last one. How much for that lot? £25 and no offers. OK, here's a tenner. I'll be back in twenty minutes.
Thirty five bimetallic hole saws, 16mm - 127mm, large and small arbors and long extension bars. Only three had been used and only three were duplicates. Milford, an American company which went out of business in 1982 iirc, and I reckon they're as good as all but the best on the market now.